Add-on wheelbarrow handle



FIG. 1 shows a perspective view of my claimed design;

FIG. 2 shows a side view of my claimed design of which the view from the other side is identical;

FIG. 3 shows a front view of my claimed design;

FIG. 4 shows a rear view of my claimed design;

FIG. 5 shows a top view of my claimed design; and,

FIG. 6 shows a bottom view of my claimed design. 

The ornamental design for an add-on wheelbarrow handle, as shown and described. 